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Published on: June 11, 2012
The Individualized Target HbA1c: A New Method for Improving Macrovascular Risk and Glycemia Without Hypoglycemia and
1Diabetes Research Center, Department of Medicine, Hadassah-Hebrew University Hospital, Jerusalem 91120, Israel.
Insights
Individualized glycemic control targets and drug selection are crucial for managing diabetes, especially concerning cardiovascular health. Tailoring treatment reduces risks and improves outcomes for diverse patient groups.
Area of Science:
- Endocrinology and Metabolism
- Cardiovascular Disease Research
- Diabetes Mellitus Management
Background:
- Improved glycemic control demonstrably reduces microvascular complications in diabetes.
- Evidence remains inconclusive regarding the impact of glycemic control on macrovascular disease, including cardiovascular outcomes.
- Recent large trials (ACCORD, ADVANCE, VADT, UKPDS-80) yielded conflicting results on intensive glycemic control and macrovascular events.
Purpose of the Study:
- To critically evaluate the methodologies of recent large diabetes trials.
- To propose an individualized approach for setting glycemic control targets (HbA1c).
- To suggest a framework for selecting hypoglycemic agents based on multiple patient-specific factors.
Main Methods:
- Analysis of trial designs, focusing on patient populations and potential biases.
- Development of a patient-centered method for determining individualized HbA1c targets.
- Creation of a scoring system to compare and select hypoglycemic drugs based on efficacy and safety profiles.
Main Results:
- Inadequacies in trial structures (e.g., elderly patients with pre-existing complications) may explain unfavorable outcomes in ACCORD, ADVANCE, and VADT.
- The UKPDS-80 follow-up indicated benefits of intensive glycemic control initiated in newly diagnosed patients.
- An individualized HbA1c target considers potential benefits, hypoglycemia risk, and consequences.
Conclusions:
- A tailored HbA1c goal is essential, differing for young, newly diagnosed patients versus elderly patients with comorbidities.
- Drug selection should extend beyond glycemic control to include weight effects, durability, cardiovascular protection, and side effect profiles.
- An individualized treatment strategy, combining tailored HbA1c goals and appropriate drug selection, optimizes patient care in diabetes management.
Abstract:
Both the DCCT and UKPDS trials demonstrated that improved glycemic control reduces microvascular complications. Inconclusive evidence, however, has remained on the question of the effect of glycemic control on macrovascular disease (with special emphasis on cardiovascular morbidity and mortality). In the last year, the data from four large trials were published, directly addressing this question (ACCORD, ADVANCE, VADT and UKPDS-80), yet the results were conflicting. Close inspection of the structure of three of these trials (ACCORD, ADVANCE and VADT) revealed inadequacies that may explain the unfavorable results, such as the inclusion of mainly elderly patients with previous macrovascular complications. It is not surprising that intensive glycemic control resulted in a rise of hypoglycemic events yet did not decrease macrovascular morbidity or mortality in these cohorts. On the other hand, the UKPDS-80 trial, a follow-up of the original UKPDS, showed that intensive glycemic control was beneficial when initiated in newly diagnosed patients. These results led us to develop a new individualized method of determining the target HbA1c based on the characteristics of the individual. This method considers the patient's possible benefit from glycemic control, the risk of suffering hypoglycemic events and consequences suffered from the hypoglycemic event. It is essential that the target HbA1c be tailored to the patient, with different goals set for the recently diagnosed "healthy" and young patient on the one hand, and the elderly patient with co-morbidities and polypharmacy on the other hand. We further suggest a method of comparing and choosing between the different hypoglycemic drugs available. Drugs should be considered not only based on their hypoglycemic effect but also on several other attributes such as effects on weight, glycemic durability, cardiovascular protection, individual experience with the drug, method of delivery and side effect profiles. Scoring the different attributes allows us to compare between different preparations and choose the most suitable drugs for each individual patient. Using our newly suggested system, a physician will first calculate the adequate HbA1c goal for his patient and then choose the drug that will best suit him, thus tailoring the treatment to the patients needs.
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